One of best feature in Solaris 10 is ZFS
ZFS was introduced in Solaris 10 update 2 , but ZFS is very young FS, there are many advancement in opensolaris and some are backported in Soalris 10.
Recently the intruducation of Openstorage and Unified Storage Appliance future introduce features that only presented in Unified Storage Appliance.
- ZFS Configuration Guide
- ZFS Best Practice Guide
- ZFS Evil Tuning Guide
- ZFS Troubleshooting Guide
- ZFS for Database
IMHO, Sun should speedup putting features/fixes back in Solaris 10, so many enterprise customer can take advantage of ZFS features.
- user quota, right now one need separate FS for user quota and become issues when one need to setup quota for thousands users